srsly just spend about 2 months power chording it up and you can work on your strumming and picking technique, and it still sounds good.
also if you want to tune your guitar sans tuner
you can fret the 5th fret on every string except the 3rd (fret the 4th for that one) and tune up to that. like fret the 6th string and compare it to the 5th string open, and it should sound the same.